Unitary bowling ball return track



FIG. 1 is a perspective view of a unitary bowling ball return track showing our new design; and,

FIG. 2 is a sectional view thereof taken along line 2--2 of FIG. 1.

It is understood that the broken lines in FIG. 1 indicate a continuation of the claimed design.

The bottom of the claimed design is plain and unadorned. 

The ornamental design for a unitary bowling ball return track, as shown and described. 